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Versions: 17
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Stored size: 1.27 KB
Contents
'use strict';
// https://github.com/tc39/proposal-iterator-helpers
var $ = require('../internals/export');
var anObject = require('../internals/an-object');
var toPositiveInteger = require('../internals/to-positive-integer');
var createAsyncIteratorProxy = require('../internals/async-iterator-create-proxy');
var AsyncIteratorProxy = createAsyncIteratorProxy(function (arg, Promise) {
var state = this;
return new Promise(function (resolve, reject) {
var loop = function () {
try {
Promise.resolve(
anObject(state.next.call(state.iterator, state.remaining ? undefined : arg))
).then(function (step) {
try {
if (anObject(step).done) {
state.done = true;
resolve({ done: true, value: undefined });
} else if (state.remaining) {
state.remaining--;
loop();
} else resolve({ done: false, value: step.value });
} catch (err) { reject(err); }
}, reject);
} catch (error) { reject(error); }
};
loop();
});
});
$({ target: 'AsyncIterator', proto: true, real: true }, {
drop: function drop(limit) {
return new AsyncIteratorProxy({
iterator: anObject(this),
remaining: toPositiveInteger(limit)
});
}
});
Version data entries
17 entries across 16 versions & 6 rubygems